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A radial mesoporous silica (mSiO2) supported Eu3+‐functionalized carbon dots (CDs) nanocomposite (mSiO2‐CDs‐Eu) was successfully prepared using citric acid as CD precursors, showing specific ratiometric tetracycline (TC) fluorescence sensing behavior. The blue fluorescence of CDs is quenched by the internal filtering effect with TC, and the red fluorescence intensity of Eu3+ ions is improved on account...
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